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DSEQUOIA ANALYTICAL <br /> — 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> Gx..:,. <br /> Waterwork Client Project ID: 20241-1, Kooyman Trucking <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Attention Robert Juncal QC Sample Group 911-3618Reported Dec 6 1989 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1 Dichloroethene Trichloroethene Chloro- <br /> benzene <br /> Method: EPA 8010 EPA 8010 EPA 8010 <br /> Analyst: L Saunders L Saunders L Saunders <br /> Reporting Units: Ng/kg Ng/kg Ng/kg <br /> Date Analyzed: Nov 29, 1959 Nov 29, 19&9 Nov 29, 1989 <br /> QCSample#: 911-1543 911-1543 911-1543 <br /> Sample Conc: N.D. N.D. N.D. <br /> Spike Conc. <br /> Added: 25 25 25 <br /> Conc. Matrix <br /> Spike: 15 20 20 <br /> Matrix Spike <br /> %Recovery: 60 80 80 <br /> Conc. Matrix <br /> Spike Dup.: 17 21 20 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 68 84 80 <br /> Relative <br /> % Difference: 12.5 4.9 0 <br /> SEQUOIA ANALYT AL %Recovery: Conc.of M.S.-Conc.of Sample x 100 <br /> Spike Conc.Added <br /> Relative%Difference: Conc.of M.S..Conc.of M.S.D. z 100 <br /> Bj A. Bjorkman (Conc.of M.S. + Conc.of M.S.D.) 2 <br /> Project Manager <br /> 9113615.WAT <4> <br />